●120.581、0.25、≥、≤、≠、≈用英语怎么读啊?●还有15.3mg/L、15.3g/m2（m2为平方米的意思）英语怎么读?

●120.581、0.25、≥、≤、≠、≈用英语怎么读啊?
●还有15.3mg/L、15.3g/m2（m2为平方米的意思）英语怎么读?

●120.581 (one hundred twenty point five eight one)、
0.25 (nought) point two five)、
≥ (not less than/more than or equal to)、
≤ (not more than/less than or equal to)、
≠ (not equal to)、
≈ ( approximately equal to )
●15.3mg/L
(fifteen point three minigram per litre)、15.3g/m2
（fifteen point three gram per square metre)